Megalovania was composed by Toby Fox and became widely recognized through Undertale, released in 2015. In the game, it plays during the battle with Sans on the Genocide Route, which explains its strong connection to spoilers and difficult boss fights. Short excerpts spread through gaming videos, remixes, animations, and meme edits, while altered spellings such as Mogolovonio became playful labels for fan-uploaded versions. The melody remains popular because audiences can recognize its dramatic Undertale association within only a few notes.